Zoom of the region-of-interest of 3″ × 3″ belonging to BP (b) from Fig. 2. Lower two panels: intensity of the Si I line in the core (left) and averaged blue wing at around λ₀ − 0.35 Å (right), where BPs are well detected. Middle left (right) panel: unsigned maximum signal in Stokes V_max/I_c from the Si I 10827 Å (Ca I 10839 Å) line. Upper left panel: longitudinal magnetic field at log τ = −1 inferred from the Si I inversions. A zoom of the HiFI blue-continuum image showing the fine structure is exhibited in the upper right panel. Pixels enclosed inside the white contours show atypical Si I Stokes V profiles, with two discernible red lobes like the example shown in Fig. 6.